I do not have a Bergara, but a few months back bought a new Rem 700 5R in 6.5 CM and while breaking in the barrel I had problems with Nosler 140 BT also. I had 4-5 boxes in 2-3 of the boxes NONE of the rounds would allow bolt closure. The other boxes...everything was fine. The rifle shot various brands fine, i.e. Hornady, Winchester, Federal, etc. with no problems. I emailed Nosler about it and was totally ignored.
Have a Bergara HMR 14, 6,5 Creedmoor. Chambers factory and reloaded ammo no problem. Chambers but will not fire small rifle primers in Lapua brassI'm out shooting right now, and the bolt wont close. Brand new bergara b-14 6.5 creedmoor, never fired. Trying factory Nosler 120 gr ballistic tips. Tried to chamber one, bolt wont close, tried another and another. Very tight. Forced it on one and drag marks on bullet. Not firing it because from what I'm seeing it looks to be jammed .250" When I get home I'll start taking measurements to see what's going on, but just from my description and the picture below what say you?
One chambered, one not.View attachment 123871